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require_relative '../../spec_helper'
require_relative 'shared/arithmetic_coerce'
describe "Integer#+" do
it_behaves_like :integer_arithmetic_coerce_not_rescue, :+
context "fixnum" do
it "returns self plus the given Integer" do
(491 + 2).should == 493
(90210 + 10).should == 90220
(9 + bignum_value).should == 18446744073709551625
(1001 + 5.219).should == 1006.219
end
it "raises a TypeError when given a non-Integer" do
-> {
(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
13 + obj
}.should raise_error(TypeError)
-> { 13 + "10" }.should raise_error(TypeError)
-> { 13 + :symbol }.should raise_error(TypeError)
end
end
context "bignum" do
before :each do
@bignum = bignum_value(76)
end
it "returns self plus the given Integer" do
(@bignum + 4).should == 18446744073709551696
(@bignum + 4.2).should be_close(18446744073709551696.2, TOLERANCE)
(@bignum + bignum_value(3)).should == 36893488147419103311
end
it "raises a TypeError when given a non-Integer" do
-> { @bignum + mock('10') }.should raise_error(TypeError)
-> { @bignum + "10" }.should raise_error(TypeError)
-> { @bignum + :symbol}.should raise_error(TypeError)
end
end
it "can be redefined" do
code = <<~RUBY
class Integer
alias_method :old_plus, :+
def +(other)
self - other
end
end
result = 1 + 2
Integer.alias_method :+, :old_plus
print result
RUBY
ruby_exe(code).should == "-1"
end
end
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